Other light types are ignored or converted to one of the above supported types when the stage is uploaded into AEM 3D. The converted types are used when you view the asset and when you render using the built-in Rapid Refine renderer. The original light types are used when rendering with Maya.

Create a ground plane, if required, and apply a suitable material.

Adobe recommends that you set up a ground plane as single-sided. Doing so ensures that you can view the asset from below in AEM 3D without the ground plane hiding the asset.

(Optional) Create and configure cameras.

Have the cameras "look" toward the center of the scene where the asset will be inserted. Be sure you set the cameras to renderable.

Set up rendering with Mental Ray.

Configure the Render Settings with the following suggestions:

Common tab
Deselect the Alpha channel (mask) check box for all Renderable Cameras.

Quality tab

Overall quality- 0.5 or less

Indirect Diffuse (GI) Mode - Final Gather

Filter Size - 2.0, 2.0

Render the scene at the typical image sizes that you expect to use. If necessary, refine the lights, or Render settings, or do both to achieve the results you want.
Be aware that rendering with Mental Ray, using image-based lighting, is very slow and CPU-intensive. Adobe recommends that you configure the lowest quality settings that are still capable of producing the desired render quality.